Glass-drawing apparatus.



' L.A.THORNBURG.

GLASS DRAWING APPARATUS.

APPLICATION FILED NOV. 12, 1913- 1,183,697. Patented May16,1916.

2 SHEETS--SHEET I.

HVENTOR L. THORNBURG.

GLASS DRAWlNG APPARATUS.

APPLICATION FILED NOV. 12, 1913.

2 SHEETS SHEET 2- wrmzssss I mvzm'on waldw fzcf I v Patented May 16,1916.

LINCOLN A. THORNBURG, OF MUNCIE, INDIANA. ASSIGNOR T WINDOW GLASSMACHINE COMPANY, OF PITI SBUBfi-H, PENNSYLVANIA, A CORPORATION 01' NEWJERSEY.

GLASS-DRAWING AJBPARATUS.

Specification of Letters Patent.

Patented. May 16, 1916.

Application filed November 12, 1913. Serial 1\To. 800,530.

To all whom, it may concern:

Be it known that I, LINCOLN A. THORN- BURG, a citizen of the UnitedStates, residing at Muncie, Delaware county, Indiana, have invented anew and useful Improvement in Glass-Drawing Apparatus, of

. which the followin ris a full, clear, and e:-

act description, re erence being had to the accompanying drawings,forming part of this specification, in which Figure 1 is a sideelevation, partly in section, showing one form of glass-drawingapparatus constructed in accordance with my invention; Fig. 2 is a planview of the clamping ring, partly in section; Fig. 3 is a perspectiveview showing one-half of ,the clamping ring with its trunnion; Fig. 4 isa central sectional view of the pot; and Fig. 5 is a central sectionalview of the pot-furnace with the pot in place, it being taken at rightangles to Fig. 1.

My invention relates to the drawing of glass from pots or receptaclesinto which molten glass is fed, and particularly to the type ofreversible pot shown in my United States Patent No. 759,329, dated May10,

' 190-1, for glass-drawing apparatus. In the furnace of said priorpatent the refractory pot was molded with integral trunnions whichprojected through the slots in the sides of the furnace walls. used forthe furnace, ered before turning. In the present invention, therefractory pot, which is preferably a double reversible and the pot waslowone, is formed without trunnions and is suptwo-part clamping ring,

ported within a metal ring, preferably a with trunnions. These trunnionsare preferably located above the top of the furnace so/that no slots areneeded in the furnace walls, thus simplifying and cheapening theconstruction.

In the drawii gs, 2vrepresents the turningpot which I have shown as ofdouble reversible form having opposite cavities? 2; to receifisuccessiveportions-of molten glass. This pot is preferably-formed with acircumferential recess 4 ,to'recei-ve a cormg ring, which ispreferably'formed'of a v plurality of parts. In the forin shown it mentbetween the ing 10 of steel or iron,

A top-stone was which is provided responding annular projection on aclamp-- ings are preferably flanged as shown at 7, these flanges beingperforated to receive bolts by which the clamping ring is secured inplace around the pot. The engagepot and ring may, of course, be of anydesired form, instead of the tongue-and-groove shown, or the ring may bemerely a plain ring made in parts and drawn tightly together around thepot.

he furnace 9 is preferably in the form of a refractory cylinder with anouter casand of a proper size to fit about the lower portion of the potwhen in position, as shown in Figs. 1 and 5. The walls are preferably ofinverted frusto-conical shape in their lower portions to direct theglass downwardly through the hole or eye 11 as it is melted out of thelower cavity. For this. melting I referably employ gas burners which preveradaly project through the burner openings 12 in the side walls of thefurnace and may be directed upwardly toward the pot cavity or not asdesired.

To lift nism of shown in the guides 13 for the sliding supports 1 1,

carrying the trunnion bearings, are preferably directly connected to thecasing of the furnace, thus aimiding the considerable overhang of-myprior patent. To lift the pot I connect the levers 15 with the supports14 through adjustable, swinging links 16. The levers are pivoted onopposite sides of. the furnace and their outer ends are provided. withsegmental. racks 17 engaging toothed wheels 18 secured to a shaft 19having operating handle 20, which is preferably provided with thelocking-dog mechanism 21, as in my prior patent. To turn the pot, I showsprocket wheels 22, secured to its trunnions between the bearings, andover which extend sprocket chains 23 which engage sprocket Wheels 24 ona'shaft 25 having operating handle 26. When in the pot preferably hangsslightly within the wall of the furnace, and the iron clamping ringrests on the top of this cylinder wall, as shown in Figs. 1 and, 5.

H In using the apparatus, the pot rests in the position as shown in Fig.5, and the glass cylinder orvother article isdrawn from the. glass bathin the top cavity. At the same time, the waste glass from the previousdraw osition,

, upper cavity." When is being melted out of the bottom cavity,

the heat also serving to heat the glassin the the drawing is completedfrom the upper cavity, the. pot is lifted, turned over, and dropped backinto sition a fresh batch of molten glass is fed into the upper cavityand the operations repeated.

The advantages of my invention from the use of'the clamping ring,preferably carries the trunnions result which This makes the manufactureof the pot cheaper,

easier and more economical. The difficulty of forming trunnions on thepot is avoided and the apparatus simplified. Furthermore, by setting thepot above the top-stone, the glass in the bath is cooled more rapidly,thus increasing the production by increas; ing the drawing speed of themachine. With coolerglass, the drawing may be performed more rapidly,while with hotter glass, it may proceed more slowly to set properly andgive the desired thickness. Where the pot is inclosed in the furnace,the glass. cools more slowly, and some quently, the drawing speed mustbe slower than in the present form. Also, by doing away with thetop-stone, the furnace is made cheaper and easier to manufacture and maybe made in the cylindrical form shown, to fit the circumference of thepot.

A pot with a single cavity may be used; the mechanism for raising andturning may be varied; the shape of the pot and furnace may be changed;other forms of clamping rings may be used; and other variations may bemade without departing from my invention.

I claim: l

1. A glass-drawing pot, comprising a reaisaeev fractory pot body havingopposite pot cavi ties therein separated by a common bottom wall, and ametal carrier ring having'trunnions' and embracing said body, said ringthe pot body being of less diameter than the the furnace whereby it willand said ring norsaid ring and top portion of seat partially therein,mally resting on the furnace,

its trunnion taking the entire weight of the pot, substantially asdescribed.

3. A glass-drawing apparatus, compris ing a reversible pot body havingpot cavities formed in opposite sides thereof, and a metallic ringembracing the exterioriofsaid body and having trunnions, in combinationwith a heating furnace over which the pot is supported on saidtrunnions, the pot being of a diameter relative to the diameter of thetop opening of the furnace to fit partially within said openingoin bothof the re versed positions, said ring normally resting on the top of thefurnace, and the pot body being itself free of any supporting engagementwith tially-as described. v In testimony, whereof, I have hereunto setmy hand. his

LINCOLN AL" X THORNBURG.

mar Witnesses:

JOHN F. Mnnnnrrn, CLARA E. THORNBURG.

the wall of the furnace, substan-

